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In this section, we'll learn
about one of the most useful

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features of object-oriented
programming languages, inheritance.

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Conceptually inheritance
is easy to understand.

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However, inheritance in
c++ can be very complex.

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We'll keep it simple in this section
so that the basics of inheritance in

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c++ are clear and you can have the
foundation to study more advanced

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concepts in more advanced courses.

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First, we'll look at what inheritance
is and why it's so useful, think

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reusability, and then we'll discuss
some of the terminology and notations

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used when talking about inheritance.

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Aggregation is also a reusability
mechanism, and we'll see the

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difference between inheritance
and aggregation since many times

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we can use aggregation instead of
inheritance to achieve what we want

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and avoid unnecessary complexity.

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Then we'll get into the
syntax of inheritance in c++.

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We'll learn how to derive one
class from an existing class

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and discuss the three types of
inheritance provided by c++.

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You may recall when we talked
about the public and private class

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access modifiers in section 13.

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I mentioned that there
was a third type of access

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modifier name protected.

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Well, protected is used in the
context of inheritance, and

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we'll see how it can be useful
in that context in this section.

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Then we'll look at constructors and
destructors and see how they work when

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we've got inheritance hierarchies.

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With inheritance, we can create
new classes that modify the

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behavior of their parent classes.

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So we'll see how that works
and how it can be useful.

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Finally, we'll talk about what class
hierarchies are, and we'll do a short

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introduction to multiple inheritance.

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Once we understand the basics of
inheritance in this section, the

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next section will really open up
the power of c++ when we talk about

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polymorphism when it's used with
inheritance and polymorphic methods.

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So let's head to the next video and
see what inheritance is all about.